Full Range markers are ideally suited for marking the location of utilities burried at a deep distance (8 feet or 2.4 meters)*. Passive full range markers will provide accurate identification of buried water lines, helping to reduce the risk of accidently excavating other buried facilites. All markers function without the need for an external power source. Their water resistant polyetheline shells are impervisous to minerals, chemicals and the temperature extreemes normally found underground. An iD version is available which allows for the stroage of customer specific information about the underground asset. *Depth range may vary on "E" (export) models - refer to product specifications.